diff --git a/broadlink/__init__.py b/broadlink/__init__.py
index 73ff30b..693820d 100644
--- a/broadlink/__init__.py
+++ b/broadlink/__init__.py
@@ -4,6 +4,7 @@ import socket
 import typing as t
 
 from . import exceptions as e
+from .const import DEFAULT_BCAST_ADDR, DEFAULT_PORT, DEFAULT_TIMEOUT
 from .alarm import S1C
 from .climate import hysen
 from .cover import dooya
@@ -143,8 +144,8 @@ def gendevice(
 
 def hello(
     host: str,
-    port: int = 80,
-    timeout: int = 10,
+    port: int = DEFAULT_PORT,
+    timeout: int = DEFAULT_TIMEOUT,
     local_ip_address: str = None,
 ) -> Device:
     """Direct device discovery.
@@ -162,10 +163,10 @@ def hello(
 
 
 def discover(
-    timeout: int = 10,
+    timeout: int = DEFAULT_TIMEOUT,
     local_ip_address: str = None,
-    discover_ip_address: str = "255.255.255.255",
-    discover_ip_port: int = 80,
+    discover_ip_address: str = DEFAULT_BCAST_ADDR,
+    discover_ip_port: int = DEFAULT_PORT,
 ) -> t.List[Device]:
     """Discover devices connected to the local network."""
     responses = scan(timeout, local_ip_address, discover_ip_address, discover_ip_port)
@@ -173,10 +174,10 @@ def discover(
 
 
 def xdiscover(
-    timeout: int = 10,
+    timeout: int = DEFAULT_TIMEOUT,
     local_ip_address: str = None,
-    discover_ip_address: str = "255.255.255.255",
-    discover_ip_port: int = 80,
+    discover_ip_address: str = DEFAULT_BCAST_ADDR,
+    discover_ip_port: int = DEFAULT_PORT,
 ) -> t.Generator[Device, None, None]:
     """Discover devices connected to the local network.
 
@@ -218,5 +219,5 @@ def setup(ssid: str, password: str, security_mode: int) -> None:
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  # Internet  # UDP
     sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
     sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
-    sock.sendto(payload, ("255.255.255.255", 80))
+    sock.sendto(payload, (DEFAULT_BCAST_ADDR, DEFAULT_PORT))
     sock.close()
diff --git a/broadlink/const.py b/broadlink/const.py
new file mode 100644
index 0000000..19c37f5
--- /dev/null
+++ b/broadlink/const.py
@@ -0,0 +1,5 @@
+"""Constants."""
+DEFAULT_BCAST_ADDR = "255.255.255.255"
+DEFAULT_PORT = 80
+DEFAULT_RETRY_INTVL = 1
+DEFAULT_TIMEOUT = 10
diff --git a/broadlink/device.py b/broadlink/device.py
index 1399628..c1f8fa8 100644
--- a/broadlink/device.py
+++ b/broadlink/device.py
@@ -9,16 +9,17 @@ from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
 
 from . import exceptions as e
+from .const import DEFAULT_BCAST_ADDR, DEFAULT_PORT, DEFAULT_RETRY_INTVL, DEFAULT_TIMEOUT
 from .protocol import Datetime
 
 HelloResponse = t.Tuple[int, t.Tuple[str, int], str, str, bool]
 
 
 def scan(
-    timeout: int = 10,
+    timeout: int = DEFAULT_TIMEOUT,
     local_ip_address: str = None,
-    discover_ip_address: str = "255.255.255.255",
-    discover_ip_port: int = 80,
+    discover_ip_address: str = DEFAULT_BCAST_ADDR,
+    discover_ip_port: int = DEFAULT_PORT,
 ) -> t.Generator[HelloResponse, None, None]:
     """Broadcast a hello message and yield responses."""
     conn = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
@@ -70,7 +71,7 @@ def scan(
         conn.close()
 
 
-def ping(address: str, port: int = 80) -> None:
+def ping(address: str, port: int = DEFAULT_PORT) -> None:
     """Send a ping packet to an address.
 
     This packet feeds the watchdog timer of firmwares >= v53.
@@ -97,7 +98,7 @@ class Device:
         host: t.Tuple[str, int],
         mac: t.Union[bytes, str],
         devtype: int,
-        timeout: int = 10,
+        timeout: int = DEFAULT_TIMEOUT,
         name: str = "",
         model: str = "",
         manufacturer: str = "",
@@ -292,7 +293,7 @@ class Device:
 
             while True:
                 time_left = timeout - (time.time() - start_time)
-                conn.settimeout(min(1, time_left))
+                conn.settimeout(min(DEFAULT_RETRY_INTVL, time_left))
                 conn.sendto(packet, self.host)
 
                 try:
diff --git a/cli/broadlink_cli b/cli/broadlink_cli
index 36a83e1..f7a24ad 100755
--- a/cli/broadlink_cli
+++ b/cli/broadlink_cli
@@ -5,6 +5,7 @@ import codecs
 import time
 
 import broadlink
+from broadlink.const import DEFAULT_PORT
 from broadlink.exceptions import ReadError, StorageError
 
 TICK = 32.84
@@ -102,7 +103,7 @@ elif args.mac:
     mac = bytearray.fromhex(args.mac)
 
 if args.host or args.device:
-    dev = broadlink.gendevice(devtype, (host, 80), mac)
+    dev = broadlink.gendevice(devtype, (host, DEFAULT_PORT), mac)
     dev.auth()
 
 if args.joinwifi:
diff --git a/cli/broadlink_discovery b/cli/broadlink_discovery
index c098c91..477e1bd 100755
--- a/cli/broadlink_discovery
+++ b/cli/broadlink_discovery
@@ -2,12 +2,13 @@
 import argparse
 
 import broadlink
+from broadlink.const import DEFAULT_BCAST_ADDR, DEFAULT_TIMEOUT
 from broadlink.exceptions import StorageError
 
 parser = argparse.ArgumentParser(fromfile_prefix_chars='@')
-parser.add_argument("--timeout", type=int, default=5, help="timeout to wait for receiving discovery responses")
+parser.add_argument("--timeout", type=int, default=DEFAULT_TIMEOUT, help="timeout to wait for receiving discovery responses")
 parser.add_argument("--ip", default=None, help="ip address to use in the discovery")
-parser.add_argument("--dst-ip", default="255.255.255.255", help="destination ip address to use in the discovery")
+parser.add_argument("--dst-ip", default=DEFAULT_BCAST_ADDR, help="destination ip address to use in the discovery")
 args = parser.parse_args()
 
 print("Discovering...")